Getorix

Talk to him to learn more about the Fist of Guthix and his theory about what the Fist of Guthix is. His theory is:
"At the end of the God Wars, Guthix returned to Gielinor and was angered by the destruction caused by the other gods in their vanity and quest for power. So, maybe he punched the ground in anger, leaving an imprint of power on the ground that has lasted ever since. Because he was angry at the time, the power would have been tainted with aggression, which is why he left Fiara as a guardian, to make sure the power did not escape unfettered."